
In February 2011 the FAA issued an Airworthiness Directive calling for removal of chemical oxygen generators from airplane lavatories, or emptying the generator and restowing the masks. (By the way, no one told the passengers that there was no longer any supplemental oxygen supply in the bathrooms.) While security wasn’t mentioned in the AD, apparently there was a safety problem. Or as the FAA so confoundingly put it in the new final rule, which rescinds the 2011 AD, “This AD was prompted by reports that the current design of the oxygen generators presents a hazard that could jeopardize flight safety. We are issuing this AD to eliminate a hazard that could jeopardize flight safety and to ensure that all lavatories have a supplemental oxygen supply.”

